CN112382858A - Light-adjustable four-frequency-band terahertz metamaterial absorber based on all-dielectric material - Google Patents
Light-adjustable four-frequency-band terahertz metamaterial absorber based on all-dielectric material Download PDFInfo
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- CN112382858A CN112382858A CN202011147404.5A CN202011147404A CN112382858A CN 112382858 A CN112382858 A CN 112382858A CN 202011147404 A CN202011147404 A CN 202011147404A CN 112382858 A CN112382858 A CN 112382858A
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- 239000006096 absorbing agent Substances 0.000 title claims abstract description 44
- 239000003989 dielectric material Substances 0.000 title claims abstract description 14
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 22
- 239000010703 silicon Substances 0.000 claims abstract description 22
- 239000000758 substrate Substances 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 9
- 239000004065 semiconductor Substances 0.000 claims abstract description 9
- 239000002210 silicon-based material Substances 0.000 claims abstract description 4
- 230000003287 optical effect Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000010521 absorption reaction Methods 0.000 description 26
- 238000005286 illumination Methods 0.000 description 11
- 239000002184 metal Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
- H01Q17/007—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems with means for controlling the absorption
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Abstract
The invention discloses an all-dielectric-material-based light-adjustable four-band terahertz metamaterial absorber which comprises a square substrate layer made of semiconductor materials, wherein a grating layer is arranged on the top of the substrate layer, and an N-type doped silicon layer covers the top of the grating layer. The semiconductor material of the substrate layer is an N-type doped silicon material with the resistivity of 0.012-0.014 omega-cm. The total thickness of the substrate layer and the grating layer is 280-320 mu m. The grating layer has a structure period p of 280-340 μm, a grating groove width w of 60-100 μm, and a grating depth t2100 to 120 μm. The thickness of the N-type doped silicon layer is t3The resistivity of the N-type doped silicon is 10-40 mu m and is 1-10 omega cm. The invention solves the problems of complex manufacturing and poor stability of the absorber in the prior art.
Description
Technical Field
The invention belongs to the technical field of terahertz devices, and particularly relates to an all-dielectric-material-based optically-adjustable four-band terahertz metamaterial absorber.
Background
The metamaterial perfect absorber is widely concerned due to the application thereof in the fields of plasma sensors, solar cells, photoelectric detectors and the like. However, most of the existing absorbers are single-frequency or broadband absorbers, which face some limitations in the application fields of spectrum and imaging, and therefore, high-performance dual-frequency or even multi-frequency absorbers are more required. The typical multi-frequency absorber is mostly based on a three-layer structure or a multi-layer stacked structure of a metal structure layer, a dielectric layer and a metal bottom plate, and the absorber is relatively complex in structure and complex to process. And because metal is easy to be oxidized, ohmic loss is high, and thermal stability is poor, the absorber based on the metal material is limited in application. Therefore, a multiband absorber with high stability, simple structure, easy processing and excellent absorption performance is urgently needed.
In order to improve the sensing capability of the absorber, the adjustability of the absorber is of great importance, and most of the absorbers reported in the prior art change the absorption performance of the absorber by changing the geometric parameters of the absorber, so that the dynamic regulation of the absorber cannot be realized. In addition, the reconfiguration of the geometric parameters in practical application can greatly increase the cost in practical application, and is not beneficial to the development of the absorber in the sensing field. The limitation forces people to provide an absorber capable of realizing dynamic tuning, and the four-band terahertz metamaterial absorber realized by using the all-dielectric material provided by the invention is not reported at present.
Disclosure of Invention
The invention aims to provide an all-dielectric-material-based optically-tunable four-band terahertz metamaterial absorber, and solves the problems of complex manufacturing and poor stability of the absorber in the prior art.
The invention adopts the technical scheme that the all-dielectric-material-based optical tunable four-band terahertz metamaterial absorber comprises a square substrate layer made of semiconductor materials, wherein a grating layer is arranged on the top of the substrate layer, and an N-type doped silicon layer covers the top of the grating layer.
The present invention is also characterized in that,
the semiconductor material of the substrate layer is an N-type doped silicon material with the resistivity of 0.012-0.014 omega-cm.
The total thickness of the substrate layer and the grating layer is 280-320 mu m.
The grating layer has a structure period p of 280-340 μm, a grating groove width w of 60-100 μm, and a grating depth t2＝100～120μm。
The thickness of the N-type doped silicon layer is t3The resistivity of the N-type doped silicon is 10-40 mu m and is 1-10 omega cm.
The invention has the beneficial effects that the light-adjustable four-frequency-band terahertz metamaterial absorber based on the all-dielectric material realizes light adjustment, and the grating depth is t when the illumination intensity is zero2The grating structure of 100-120 mu m still realizes the four-band absorption at the original resonance frequency, and when the illumination is gradually enhanced, the absorption of the terahertz wave by the absorber is changed corresponding to different photoexcited carrier concentrations in the semiconductor material. When the illumination intensity reaches 3000 muJ/cm2When the modulation depth is up to 4.97, the absorption at the four resonance peaks changes correspondingly. In order to allow the absorber to achieve higher modulation depths, the invention covers the top of the absorber grating with a layer of N-doped silicon of different resistivity. Covering a layer of t on the top of the grating3The thickness of the N-type doped silicon is 10-40 mu m (the resistivity of the doped silicon is 1-10 omega cm). When the illumination intensity is zero, the grating structure with the grating depth of 100-120 mu m can generate three resonance peaks at 0.4668THz, 0.9797THz and 1.8859THz, and the absorption can reach 94.05%, 97.19% and 85.89%. When the illumination is gradually enhanced, the absorption of the terahertz wave by the absorber is changed. When the illumination intensity reaches 1800 mu J/cm2When the absorption at the three resonance peaks is reduced to 75.28 percent,
drawings
FIG. 1 is a microscopic structure of the present invention under a microscope;
FIG. 2 is a quad-band absorption characteristic of the present invention;
FIG. 3 is a graph of light modulation absorption according to the present invention;
FIG. 4 is a schematic view of the top layer of the grating covered with N-type doped silicon according to the present invention;
FIG. 5 is a graph of the optical modulation absorption of a top-clad N-type silicon of the present invention.
In the figure, 1 is a substrate layer, 2 is a grating layer, and 3 is an N-type doped silicon layer.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a light-adjustable four-frequency-band terahertz metamaterial absorber based on an all-dielectric material, which is structurally shown in fig. 4 and comprises a square substrate layer 1 made of a semiconductor material, wherein a grating layer 2 is arranged on the top of the substrate layer 1, and an N-type doped silicon layer 3 is covered on the top of the grating layer 2.
The semiconductor material of the substrate layer 1 is an N-type doped silicon material with the resistivity of 0.012-0.014 omega cm.
The total thickness of the substrate layer 1 and the grating layer 2 is 280-320 mu m.
The grating layer 2 has a structure period p of 280-340 μm, a grating groove width w of 60-100 μm, and a grating depth t2＝100～120μm。
The thickness of the N-type doped silicon layer 3 is t3The resistivity of the N-type doped silicon is 10-40 mu m and is 1-10 omega cm.
Fig. 1 is an absorption curve of the absorber of the present invention, which can be derived from the data in fig. 2: the invention can realize four-frequency absorption at 0.4921THz, 1.0533THz, 1.7218THz and 2.0354THz, the absorptivity is 91.79%, 95.95%, 97.89% and 98.03%, Q value is respectively: 2.25, 11.74, 11.07 and 12.64.
FIG. 2 is a graph of the light modulation absorption of the present invention. Referring to fig. 2, it can be seen that the absorption properties of the present invention are somewhat changed under light conditions. When the illumination intensity is zero, the absorber generates four resonances at 0.4921THz, 1.0533THz, 1.7218THz and 2.0354THz, the absorptivity is all larger than 90 percent, the absorptivity changes with the gradual enhancement of illumination, and when the illumination intensity is 3000 muJ/cm2The modulation depth can reach 4.97, 0.67, 0.69 and 0.39 respectively.
FIG. 3 is a schematic view of the grating top layer covered with N-type doped silicon of the present invention, and FIG. 4 showsIt is known that to achieve higher modulation depths in light conditions, the grating is covered on top by a layer t3The N-type doped silicon has a resistivity of 1-10 Ω & cm, and has a thickness of 10-40 μm.
FIG. 5 is a top layer covered with a layer t according to the present invention3The light modulation absorption curve realized by N-type doped silicon with the thickness of 10-40 mu m is that when the illumination intensity is zero, the absorber can generate three resonance peaks at 0.4668THz, 0.9797THz and 1.8859THz, and the absorption can reach 94.05%, 97.19% and 85.89%. When the light irradiation is gradually strengthened to 1800 mu J/cm2When the light modulation depth is increased, the absorption at the three resonance peaks is reduced to 75.28%, 34% and 38.34%, and the modulation depth is respectively about 11.08%, 48.16% and 38.27%, so that the light modulation with higher modulation depth is finally realized.
The invention is composed of a square substrate at the bottom and a one-dimensional grating at the top layer. The substrate and the one-dimensional grating structure are both prepared from heavily-doped N-type doped silicon, and the resistivity is 0.012-0.014 omega cm. The whole thickness of the absorber is t1280-320 mu m, structure period p 280-340 mu m, grating groove width w 60-100 mu m, grating height t2100 to 120 μm. During work, terahertz waves are incident to the surface of the absorber, surface plasmons and Fabry-Perot resonance are excited, and therefore four-frequency-band absorption is generated at the position of 0.2-2.5 THz. The absorption can reach 99.99% at most, the minimum absorption is higher than 90%, the Q value can reach 12.64 at most, and the multi-band high-Q absorption multi-band optical fiber has the characteristics of multi-band, high absorption rate, high Q value and the like. The absorber effectively improves the absorption rate of the all-dielectric absorber to terahertz waves, realizes four-frequency-band absorption, and has the advantages of low manufacturing cost, mature processing technology and high efficiency. Meanwhile, the absorber can realize light regulation and control, and realize the tuning characteristic of absorption under illumination with different powers.
Claims (5)
1. The light-adjustable four-frequency-band terahertz metamaterial absorber based on the all-dielectric material is characterized by comprising a square substrate layer (1) made of a semiconductor material, wherein a grating layer (2) is arranged on the top of the substrate layer (1), and an N-type doped silicon layer (3) covers the top of the grating layer (2).
2. The all-dielectric-material-based optically tunable quad-band terahertz metamaterial absorber as claimed in claim 1, wherein the semiconductor material of the substrate layer (1) is an N-type doped silicon material with resistivity of 0.012-0.014 Ω -cm.
3. The all-dielectric-material-based optical tunable quad-band terahertz metamaterial absorber as claimed in claim 1, wherein the total thickness of the substrate layer (1) and the grating layer (2) is 280-320 μm.
4. The all-dielectric-material-based optically tunable four-band terahertz metamaterial absorber as claimed in claim 1, wherein the grating layer (2) has a structure period p of 280-340 μm, a grating groove width w of 60-100 μm, and a grating depth t2＝100～120μm。
5. The all-dielectric-material-based optical tunable quad-band terahertz metamaterial absorber as claimed in claim 1, wherein the thickness of the N-type doped silicon layer (3) is t3The resistivity of the N-type doped silicon is 10-40 mu m and is 1-10 omega cm.
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Cited By (3)
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|---|---|---|---|---|
| CN113161760A (en) * | 2021-03-03 | 2021-07-23 | 西安理工大学 | All-dielectric multi-band terahertz metamaterial absorber with randomly distributed units |
| CN114088663A (en) * | 2021-10-29 | 2022-02-25 | 西安理工大学 | Terahertz sensor based on symmetrical protection type continuum bound state |
| CN115911881A (en) * | 2023-02-23 | 2023-04-04 | 天津大学 | Flexible modulable terahertz filter based on all-dielectric material |
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| CN114088663A (en) * | 2021-10-29 | 2022-02-25 | 西安理工大学 | Terahertz sensor based on symmetrical protection type continuum bound state |
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